I dunno, I think to do that they'd have to have an Apple App Store level of oversight on their third party devs products, which would be about as restrictive to the devs as the changes they actually did make, plus prohibitively expensive for Twitter.
That's not true at all. As someone who had multiple Twitter API apps killed by them, I would have welcome app store level review processes. Limiting tokens (killing any popular app) and killing games that let you tweet easily because they are too much like general purpose clients like they did was just ridiculous. The best apps I know, like Foursquare, just switched back to asking users for username and password at the time because the token limitation basically broke integration.
Seems doable. They have over 3,500 people there (really don't see why they're not at, say, 150). Surely they have enough resources to handle the necessary oversight. I would imagine most could be automated with spot checking by actual people.
